He was sentenced to death in 2004 for the attack and other crimes including another sarin gas attack in 1994 in Matsumoto, which killed eight people and injured more than 100 others.

The execution of the leader and six other members of the Supreme Truth, came as a result of a 20-year investigation in which all those involved in the incidents have been tried and convicted.

The Supreme Court rejected their appeals in January.

The Japanese Tribunal has prosecuted about 190 cult members for the attacks and other related crimes, including the 1989 murder of lawyer Tsutsumi Sakamoto and his family, and passed six life sentences and 13 death sentences.